Listing machine



1942- L. P. CROSMAN I LISTING MACHINE Filed Dec. 20, 1941 2 Sheets-Sheet2 INVENTOR LOMYH E'Cflosrpan I Y I T-roRNEY Patented Nov. 3, 1942LISTING MACHINE.

Loring Pickering Crosman, South Orange, N. J.,

assignor to Monroe Calculating Machine Company, Orange, N. J., acorporation of Delaware Application December 20, 1941, Serial No.423,809

2 Claims. (01. 197-64) The invention relates to listing machines andmore particularly to means for governing the tabulating movement of theplaten carriage of such a machine.

The invention consists in the novel construction and combination ofparts, as set forth in the appended claims.

In the accompanying drawings, illustrating the invention:

Fig. 1 is a fragmentary rear elevation of the carriage shifting means ofa listing machine embodying the invention, parts being broken intosection.

Fig. 2 is a detail section taken on line 22 of Fig. 1.

Fig. 3 is a detail section taken on line 3-3 of Fig. 1.

Fig. 4 is a detail sectional view showing a modilied form of theinvention.

Fig. 5 is a detail right side elevation of the modified governing means.

The tabulating and carriage return mechanism to which the invention isshown as applied is disclosed in United States Patent No. 1,946,572,issued to Loring P. C'rosman on February 13, 1934, and entitled Listingcalculator.

The platen carriage is tabulated by means of a spring 8 (Fig. 1) mountedin a drum whereon a tape 9 is wound, said tape being attached to theright side frame plate 3 of the carriage. The tabulated position of thecarriage is controlled by a tabulator bar I, mounted in the carriageframing and having a series of spaced shoulders I93 designed to bebrought into engagement with a detent 1 mounted in the main frame of themachine. Normally, detent 1 holds the carriage against the tension ofspring 8, the detent being removed by the action of a trigger I84, thehook end of which is engaged over the end of the deaccordance with thecharacter of the work to be done, that is to say, in accordance with thespacing of the columns in which printing is to be effected, andtherefore this spacing may be quite irregular, and the extent to whichthe platen carriage is to be shifted by spring 8 may vary conmovement isgreat, excessive speed may be attained, and the engagement of tabulatingbar I with detent I may be violent. It is the object of the presentinvention to govern the speed of the tabulating movement, and thereby toreduce the shock of bringing the carriage to rest;

It is intended that the carriage movement shall be governed by the speedof a part driven by an electric motor and, as shown, parts of the motordriven carriage return mechanism are employed for this purpose.

The carriage return drive is effected through shaft 41 (Fig. 1)connected with motor 48 by means of gearing 49, 50, EI, 52 and 53. Faston shaft 41 is a gear 239, meshing with a gear 249, loosely mounted uponshaft 23 I. A friction clutch is designed to connect gear 2% with aspring drum assembly 526, also loosely mounted upon shaft 23I, a tape'24! being wound upon said drum and connected to the left hand frameplate 3 of the platen carriage. The clutch is engaged by rockingmovement imparted to an annulus 221, having diametrically opposedinwardly extending teeth (not shown herein but illustrated in Patent No.1,946,572). The teeth of annulus 221 engage the faces of two opposeddisks 229 and rocking of annulus 22! will move the disks apart, thismovement being transmitted to the gear 240 and through a friction disk5I6 to the spring drum 526, the drum' being rotated and thereby, throughtape 2M, moving the carriage toward the right.

Normally the spring drum 526 stands disen-' gaged from the motor drive,the spring of the drum being designed to take up slack in the tape 24!.A leaf spring 5|! bearing against the friction disk SIB and against awasher inserted in a groove of shaft 23I serves to hold the frictionclutch normally disengaged.

The governor The motor driven element of the governor comprises a plate5I8, fast upon a shaft EIS and provided with two pawls 529 normally heldin inactive position by means of springs 52L Also fast on shaft 5I9 is agear 522 meshing with the gear 239, fast upon shaft 41, whereby uponoperation of motor 48 the pawls 529 will be driven in the directionindicated by the arrow in Fig. 3. .The motor will be started, wheneverthe platen carriage is tabulated, by the closing of a switch 65 in themotor circuit, this closure being effected by a stud 63 of insulationmaterial, mounted upon a lever 20, which carries the detent I.

siderably. When the extent of the tabulating Upon release of detent Ifrom tabulator bar I,

spring 22 will rock lever 28, counter-clockwise as seen in Fig. 1,thereby closing the switch 65.

The governor element which is driven in time with the movement of thecarriage comprises a ratchet 523 (Fig. 3), mounted upon a sleevesupported upon shaft 5 l 9, this sleeve being also provided with a gear524, meshing with a gear 525 which forms part of the return spring drumassembly 526. As the carriage is moved toward the left, under theinfluence of spring 8, drum 526 will be rotated by tape 24!, and ratchet523 will be rotated in the direction of the arrow, Fig. 3. Simultaneousrotation of plate 5"! by the motor will impart a centrifugal action tothe tails of pawls 520, thereby bringingthe contacting ends of the pawlsinto. engagement with ratchet 523. So long as the carriage movementdrives ratchet 523 at less speed than that of plate 5l8, pawls 520 willratchet over the teeth. of member 523, but should the speed of thecarriage movement tend to become excessive, ratchet 523 will be held'bypawls 520 to the speed'of rotation of plate 518.

Since, when motor 48 is not running, pawls 52!) will be held by springs52I out of contacting position with ratchet 523, drum 24! may beoperated, when the machine is at rest, without interference by thegovernor. Such operation of the drum is disclosed in U. S. Patent No.2,081,423, issued to Loring P. Crosman on May 25, 1937.

Alternative structure In machines in which independent action of drum24! is not provided for, the governing mechanism may be somewhatsimplified by providing governor pawls 527 (Fig. 5) which are springurged at all times into engagement with the governor ratchet.

This form of the invention is illustrated in Figs. 4 and 5, referencenumerals being applied thereto corresponding to those applied to Figs. 1to 3, but distinguished by the exponent In this form of the inventionthe spring may be removed from the drum 526', and the friction disk 515'normally held lightly in contact with the drum assembly by means of aleaf spring 528, to remove slack from the tape 24! Operation of annulus221' will effect heavy pressure of disk 5H5 against the drum assembly,as in the main form of the invention.

I claim:

1. In a listing machine having a platen carriage and tabulating meansfor said carriage including a carriage shifting spring; a memberrotatable by the spring in time with the movement of said carriage, anelectric motor, a second member rotatable by said motor, and a governingdevice mounted upon one of said rotary members and movable bycentrifugal action into engagement with the other member to preventmovement of the spring driven member at a speed exceeding the speed ofthe motor driven member.

2. In a listing machine having a platen carriage and tabulating meansfor said carriage including a carriage shifting spring; a memberrotatable by the spring in time with the movement of said carriage, anelectric motor, a, second member rotatable by said motor, a ratchetmounted on the spring driven member, and a pawl mounted on the motordriven member and movable by centrifugal action into engagement with theratchet to prevent movement of the spring driven member at a speedexceeding the speed of the motor driven member.

LORING PICKERING CROSMAN;

